Feed mechanism for dieing-out machines.



'6. B. GRovER.

FEED MECHANISM FOR DIEING OUT MACHINES.

A APPLlcATloN m2o Nov. e, |914.

Patelltd May 9, 1916.

3 SHEETS-SHEET I.

E. s @w www WW W Mn/esegesi G. B. GROVER. FEED MECHANISM FOR DIEING OUTMACHINES.

APPLICATION FILED NOV- 6' 1914.

Patented May 9, 1916.

3 SHEETS-SHEET 2.

G. B. GROVER.

FEED MECHANISM FOR DIEING OUT MACHINES.

APPLICATION FILED Nov. I9I4.

1,182,474.- Patented May 9,1916.

3 SHEETS-SHEET 3.

THE COLUMBIA PLNOGRAPH co,. WASHINGTON, D. c.

GEORGE B. GROVER, OF LYNN, MASSACHUSETTS, ASSIGNOR TO W. J. YOUNGMACHIN- ERY COMPANY, OF LYNN, MASSACHUSETTS, CORPORATION 0FMASSACHUSETTS.

FEED MECI-IANISM :FORA DIEING-OUT MACHINES.

Specification of Letters Patent.

Patented May 9, 1916.

Application filed November 6, 1914. Serial No. 870,610.

To all yw hom it may concern Be it known that I, GEORGE B. Gnovnn, acitizen of the United States, and resident of Lynn, in the county ofEssex and rState of Massachusetts, have invented certain new and usefulImprovements in Feed Mechanism for Dieing-Out Machines, of which thefollowing is a specification.

lThe present invention relates generally to machines for cutting outarticles of any description, such for example, as heel lifts, shoesoles, or other articles from sheet material by means of a die, and inwhich the material is progressively fed to the die between cuts of thelatter. y

The main object of the invention is to provide, in connection with anintermittently acting feeder, a positioning device for arresting thepiece of material or stock about to be cut by the die at a point in suchrelation to the feeder and tothe line of action of the die, that thefirst operation of the feeder' on the piece rwillcarryits radvancing endonly so far that the die whenmaking'its first cut, will trim olf theedge of the' piece. It is to be noted thatk leather-board, which is thematerial used for ythe manufacture of a large proportion of r.the heelsmade at'the present day, is produced in sheets which are more or lessuneven at their ends, such unevenness consisting eitherin a ragged lineat the edge, or less thickness at and near the edge, or in bothirregular thickness and irregular outline; and the same thing is true toa certain extent of other materials available for heel lifts and otherarticles. When heel lifts or other articles are cut by an automaticdieing out machine from sheets of this character close to the extremeends of the sheets, such articles are either irregular in thickness, ortheir youtlines may be incomplete on account of the ragged edge of theend of the sheet. It is my object in this connection to cause the firstaction of the die on an advancing piecel to cut off the uneven orraggedy edge before the piece has been advanced far enough across theline of actionv of the die for the first complete lift, or otherarticle, to be severed from the piece, sothat when finally the cuttingof complete articles from the piece commences, such articles will all beas nearly uniform as possible.

Accordingly that part of the invention which has to do with the abovestated object consists in a stop or arrester arranged to arrest theadvancing piece at such a point short of theV limit to which theintermittent feeder is adapted to propel its advancing end, that thefirst step of the movement given to the piece by such feeder will endwhen only the ragged or uneven part at the edge of the piece has crossedthe line of action of the nearer side ofthe cutting die; said stop beinglocated at the'same side of the die as that from which the pieceadvances in approaching the die, and being Vdisplaceable after havingarrested the piece soV as to permit subsequent propulsion of the latterby the feeder:

It is also a part of the invention to provide means for adjusting thestop in accordance with the peculiarities of different kinds ofmaterial, and ofdifferent pieces of the 4same kind, and according toadjustments of the feederfor alonger or shorter feed, so that the scrapthus cut off from'the'piece ywill'include only the unevenfedge and willnotcontain any material suitable for finished articles of the sortproduced inthe machine. In'y other words, so that there will benofavoidablfe waste of material in the scrap whichy must be cut off.

A second obj ect of the invention is to provide an improvedintermittentfeeder for a dieing out machine.

A third object is to provide centering devices in combination with suolidieing out machine for accurately locatingthe strip or piece of stock inrelation tothe die, and adapted to be displaced so as not to interferewith the die.

In this yspecification and the drawings forming a part thereof, l havedescribed and illustrated that embodiment of my invention which isparticularly applicable to a machine, suchy as that showny in my Patent1,066,727 granted July 8, 1913, in which strips of sheet material whichhave been fed by continuously acting feeding means past a strip cutter,are further fed by an intermittently acting reciprocating feeder intoposition to be cut by a die.v However, al-

though I have shown this particular embodii application to embraceequivalent devices `of other constructions, including such as may beapplied to other machines of whatever nature, whether such machines arepro-k body essentially the functions and principles of operation, andaccomplish the results, of the contrivances herein described,

and correspond with the spirit of the apv Y pended claims.

Vtail of the machine.

Figure 1 is a section in the line of feed of the stock of a portion of adieing out machine to which my invention is applied. Fig. Qis a crosssection on the line Q--Q of Fig. 1 andan elevation at the'p'arts ofthe-right of said line. Fig. 3 is a sectional view showing the secondaryfeeder and the stock .in a different position from that shown in Fig.1.v Fig. t is a plan view of the partof a dieing out machine to which mypresent invention is applied, parts of the machine being broken away. YFig. 5 is a plan viewof a de Fig. 6 is a sectional view on line 6 6 ofFig. 5, looking in the direction of thearrow. Fig. 't' .is a sectionalview on line 7--7 of Fig. 6 looking inl the Y direction of the arrow.Figs. 8, and 9, are

detail views illustrating diderent positions of the stop in which myinvention is em- Y upon.

bodied in relation to the material operated upon. Fig. 10 is a sectionalview of a die and centering gages used in connection with the die foilcentering the sheet material acted The same reference charactersindicate the same parts in all the figures.V

Referring t0 the drawings 10 represents a cutter ordie adaptedtopenetrate sheet material and to sever articles of the desired formtherefrom.

11 represents a block for supporting the material Yagainst the thrust ofthev die. Such block is-conveniently ofl wood or other material softerthan that of which the die is made so that the cutting edge of the diewill not be blunted by coming into Contact with the block. It is to beunderstood that `the die is carried by a holder 12 and is moved back andforth toward and away from the surface 13 of the block. I have not shownf in these drawings any means for so reciprorial may be leatherboard orany other material from which heel lifts or other articles are cut, andmay be any material whatever "having suflicient stiffnessto enableit tobe fed forward without buckling by pressure applied at a distance backfrom its advanced end. This material is fed over a table or othersupport 15 by mechanism which I may term, for the purposes of thisinvention, a preliminary feeder of'feeding means, consisting ofcomplemental rolls 16 and 17 arranged on opposite sides of the strip andpressed together so as to grip the strip between thein. Strips or piecesof the sheet material are fed by these feed rolls until the advancingend is within the field of action of the secondary feeder hereinafterdescribed. Said preliminary feeder, however, is lno part of the presentinvention, but is described because it is present in the machine towhich the herein illustrated embodiment of the invention is applied. Onthe contrary suchV embodiment of the invention does not require anautomatic preliminary feeder but performs its function in exactly thesame way and with exactly the same effect, when the preliminarv feederis omitted and the stock is brought by hand to the secondary orintermittent feeder now to be described. Y

The secondary feeder is a linger V18 arranged below the path in whichthe stock is fed and terminating in a pointed end which is inclinedtowardr and with the direction of feed.` VSuch linger is pivoted upon astud 2G on a carriage, which is mounted to travel on guide rodsQQeXtending parallel to the line of feed, and the feed finger has an arm'27 Vjointed by a pivot pin 28 to a connecting i'od or bar 22, theopposite end of which is pivoted by a pin 21 with an arm 20 mounted on arock shaft 19, The rock shaft, arm 20, )ivot 21, a screw for adjustingthe position vof the latter in a slot 23 of the arm, the bar 22, and themeans for oscillating the rock shaft, are or may be identical with thecorresponding parts fully described and illustrated in my prior Patent1,066,727 previously referred to, wherefore further descriptions of suchparts and of their mode of operation and adjustment is unnecessaryYherein. It is sufficient to say that oscillation of the rock shaftcauses reciprocation of the feed linger and of the carriageQ whereon thelatteris pivoted,

and equally causes the pointed end of the feed finger toV be forcedagainst the stock during the feeding stroke, and to be withdrawntherefrom during the return stroke, by reason of the pivotal mounting ofthe feed linger on the carriage and the fact that it is connected to thebar 22 by a crank arm at the opposite side of such pivot from the pathof the stock. The feeder and operating means therefor here' shown dierllt) from the secondary feeder'illustrated in my patent above referredto in the above described mode of mounting and connecting the feedlinger, whereby it is given a positive thrust 'toward the stock on thefeeding stroke. A plate 32 extends over the path of the sheet materialand lunder the cutting block to guide the material past the edge of theblock and to hold it against the thrust of the feed linger. Theparticularl construction and mounting of the reciprocating feedingdevice, abovedescribed,-is one of the features of the invention. f

33 represents a stop which crosses` the path of feed of thesheet'material. Said stop adjustablein the direction of `feeding and iscarried by a member 34, which I may call a stop holder. Said member 34is conveniently a strip of resilient and suiiciently stiff material,such spring metal,

which extends over the supportA or table a and beneath the sheetmaterial 14y and is secured at its rear end to a. carriage 35.Preferably the stop 33 is formed by bending up the eXtreme ,forward endofthe member V34, although it may be otherwise formed. Preferably alsosaid stop extends into contact with'they surface of the guide plate 32soas to be certain to arrestthe strip material, but it is somewhatinclined in the feeding direction m order that itkymaybe vdisplacedunder ra sufliciently strong `pressure applied by such vsheet material.kThe carriage 35 is adapted to slide in a guideway `3G in the machineframe, asy shown in Fig. 6, being retained in ysuch guidewayby holdingmembers 37. Secured to the carriage is a rack 38 in mesh with a pinion39 on a shaft 40 having a hand wheel 41; ySaid hand wheel, shaft,pinion,y and rack provide a means by which the carriage may be.

adjusted, and the guideway causes such ad- `iustments to ytake place inthe direction of feeding' of the material 14, whereby the stop 33 may beplaced,` at the desired distance 'from the lineof action of the die 1K0.The adjustments of the carriagejand stop are held bya notched wheel42'on the shaft 40 and a pawl 43 arranged to engage the .notches of saidwheel. The pawl is Vpreferably constructed and arranged, as shown inFigs. 6 and 7, as ay plungerwhich slides in a socket 44 in a part of themachine frame and is pressed upon by a spring 45 Atoward the wheel 42.The notches of the wheel and the tooth of the pawl or locking dog 43 areinclined so that the dog may be displaced by the movement of the wheelrwhen suflicient force tending to turn it is applied upon the hand wheel41.,4

In addition to theistop 33r there is proy vided a retainer 46,`which maybe formed similarly to the stop 33 as the bent up end of a strip ofresilient metal, or retainer holder, 47, which is secured to the table`15 falling away and bein the die or not cut at all.y

by screws or other fastenings 43 and extends under and in contact withthe stop holder 34. Both the stopholder and the retainer holder beingresilient, are adapted to yield and permit the stop and retainer to bedisplaced from the plate 32 under the pressure ofthe advancing end of astrip of stock, andthe resistance to yielding of the stop holder isincreased by the retainer holder 47, which contacts with and reinforcesthe stop holder.

The action of the stop and retainer is illustrated in Figs. 8 and 9. Thenormal position of these parts is that shown in Fig. 8,]where the stopand retainer both bear against, or lie close to, the guide plate 32.lhen the strip of stock is propelled by the feeder 13, it mounts up onthe inclined stop and is crowded between the latter and the guide plate,forcing the stop first, and, finally, the retainer away from the guideplate and being itself passed between them,

as shown in Fig. 9. Thereafter through thek continuation of feeding ofthe stock, the same is held against the guide plate and close to theface of the cutting block as long as any of the strip remains. Anyremnant of the strip large enough to furnish materialfor acomplete liftor other articleisal'so heldby the retainer 46, in position to be cut,and is thus prevented from y g either injured by The stop holder andretainer are made of less width than the strip of stock and the feeder18 is placed at one side of the holder and retainer so that the latterdo not interfere with its operation. If desired, there may be two ormore feeders, as here shown, placed on opposite sides of the stop holderand retainer, as shown in Fig. 4, or in any other desired way. Inaddition I may provide yielding supporting fingers 49 of the sort shownin my prior Patent No. 1,066,727 aforesaid to perform the functionsdescribed infsaid patent.

The strip of'stoclr is guided as to its position laterally of thedirection of feeding by edge guides 50 and 51, the latter being equippedwith a spring strip which is the portion of the guide 51 to make actualcontact with the strip. In addition, the portion rof the strip which isin position to be cut isfurther guided and centrally located over thedie by means of dogs 53 and 54 pivoted to the guides 50 and 51,respectively, and extending at opposite sides of the die as shown Fig.4. These dogs are pressed toward ther die by springs 55 which pressagainst the outer sides of the dogs and react against fingers 56 and 57secured to the guides 50 and 51, respectively. The springs are guided byrods 58 which pass from the dogs through the lingers and are movableendwise. These rods are provided with adjustable abutments 59 on theouter sides of the fingers, such adjustments being preferably nutsscrewed upon the ends of the rods, which limit the approach` of the dogsto the die. The faces of the dogs adjacent to the dieare inclined orbeveled as illustrated in F ig. l() so that while their upper portionsmay somewhat overlie the edge of the die, their lower portions arefarther apart than the` width of the die, allowing the latter to enterbetween them when making its cutting stroke soas to spread them apartwithout injury to either the dogs or the die. rlhese dogs insure thatthe strip, even though not materially wider than the die will be soplaced that the edge of the die may not intersect either of the sideedges of the strip.

The devices which I have thus described provide means for accuratelylocating the stock to enable as great as number asvpossible of perfectarticles to be cut with the minimum of waste from a strip havingapproximately the widtlrof the articles to be produced. The feeder is soadjusted that its travel is substantially equal to the length of thearticle to be cutvor just enough greater than that amount to makecertain that the outline of the article out will be perfect andnot'marred by a previous cut. The stop 33 serves to locate the stripbefore the first action thereon by the feeder in such a position thatthe firstoperation of the feeder will advance the strip only'so far asto carry its forward or advancedv end across the nearer side of thecutting die a .distance equal to that by which irregularities in thethickness or in theedge line of thepiece extend bacli from such edge,and the described means for adjusting the stop enables the stop tobe-,accurately positioned for this purpose. In other words, the stoparrests the piece when the advancing end thereof Vhas passed beyond theinnermost limit of travel of the intermittent feeder a distance aboutequal to the extent of such irregularity, and before the piece has beenengaged by the feeder. ln consequence the first action ofthe die willtrim off the irregular edge of the' piece, and subsequent cuttingactions will produce lifts or other articles of complete outline anduniform character, unmarred by the rirregularities which exist in theedge of the piece. The adjustment for the location of the stop and forthe eX- tent of throw of the intermittent feeder-are independent of oneanother, whereby the width of the first cut may be made sufficient to`cut off the irregular edge and no .more of the piece, while subsequentcuts may bemade to produce lifts perfect in outline without waste ofmaterial between successively cut lifts. Y v l The great advantage whichfollows from the use of the stop is the saving of material,

for the waste which previously occurred by reason of the first articlecut from a fresh piece of stock beingimperfect and having to be thrownaway, is now reduced to merely the width of the uneven edge of thepiece, and all of the materialrof substantiallyuniform thickness back ofsuch uneven edge is now made available tov be cut up into articlessuiciently perfect for the uses of commerce.

The stop will arrest the strip shortly Vbe- 1 place the stop and theretainenand it engages the strip at a point so near the stop that theintermediate length of the strip has not enough flexibility to buckle.

The terms length and width heretofore used in connection with the strip,the die, and the article cut from the strip are used with relation tothe strip, the term length meaning the dimension in the direction inwhich the strip isfed, and the term width ymeaning the dimension inadirection a1 rightV angles vto the line of feeding. A

It is to be understood that the foregoing description of my invention inconnection with theparticular machine here shown is not intended aslimiting the invention lto that particular machine only.

llhat l claim and desire to secure,V by LettersQPatent is Y 1 In a"cutting machine the combination with a cutter, and afeederconstructedand operable Vto engagea strip of stock at a point near thecutter and to yfeed the same intermittently across the line ofactionthereof,

of a stop arranged across the line of feed ofthe stock at a point on thesame side of the die as that from which the stock is fed in determinedrelation to the cutter and to Y the zone of action lof the feeder.

2. ln a die cutting machine the combinaf tionwith va cutter, and afeeder constructed and operable to engage a strip of stockat a pointnear the cutter and to feed the same intermittently across the line ofaction of the cutter, ofl a stop arranged across the line of feed of thestock at a point between the cutter and the feeder and in determinedrelation tothe cutter and to the zone of action of the feeder, said stopbeing adjustable whereby it maybe placed at varyingdistances from theline of'action of the cutter in the line of feeding.

3. In a die-cutting machine the combination with a cutter andv afeeder'constructed nica-54m and operable to engage a strip of ystock ata point near the cutter and to feedthe same intermittently across theline of action of the cutter, of a stop arranged across the line of feedof the stock at a point between the cutter and the advancing yend of thestock` in determined relation to the cutter and to the zone of action ofthe feeder, andv means for adjusting said stop toward and away from theline of action of the cutter. 4. In a die cutting machine, the combination with a die and a complemental cutting block, one of which is movedreciprocatively toward and away from the other, of a reciprocatingfeeder movable transversely to the direction of cutting action of thedie and toward and away from the latter, and a stop mounted across thepath in which the work travels when` approaching .the die'`| said stopbeing yieldingly mounted and constructed to be displaced by the pressureof the advancing work., l

In a dieing out machine, the combination withy a cutting block and a diewhich is movable toward and away from the block, of a work support, areciprocating feeder traveling toward and away from the line of movementof the die, and a stop holder extending from: said work support towardthe line of action of the die and arranged relatively to the cuttingblock to provide` a channel between itself and the block for thematerial acted upon, said holder having a Vstop crossing such channel.

6. In a dieing out machine, the combination with a cutting block and adie which is movable toward Aand away from the block, of a work support,a reciprocating feeder traveling toward and away from the line ofmovement of the die, and a stop holder extending from said work supporttoward the line of action of the die and arranged relatively to thecutting block to provide a channel between itself and the block for thematerial actedupon, said holder having a stop crossing such channel, thestop being inclined convergently toward the direction of `feeding of thematerial, and the stop holder being resilient and yielding, whereby thepressure of the advancing material is enabled to displacev the stop fromthe path of the work. y

7. In a dieing out machine, a cutting block, a cuttingdie movable toward'and away from saidblock, a work support at one side 'of the line ofaction of said die, an intermittent feeding member movable back andforth between said work support and said die, a stop holder crossing thework support and extending therefrom toward the die and separated vfromthe cuttingr block sufficiently to provide a channel through which thework may pass across the face of said block, a stop extending from saidholder toward the block, and a carriage to which said holder isconnected movable toward and away from the die.

8. In a dieing out machine, the combina tion with a coperatingrelatively recipro` cative die and cutting block of an inter,- mittentlyacting feeder for placing material between the die and cutting blockbetween successive cutting operations thereof, and a contrivancearranged to arrest a fresh piece of stock about to be operated upon insuch a location with respect to the die, and at the side thereof fromwhich the feed of stock takes plate, that the first feeding action ofsaid feeding means will carry the forwardend of the stock less than farenough to insure cutting of aperfect article, but far enough to causecuttingfoif of the uneven forward edge of such stock.

9. In a dieing out machine, the-combination kwith a coperatingrelatively reciprocative die andcutting block, of a primary feeder forbringing a piece of stock toward the location of said die, a secondaryfeederl into the zone of action of which the piece is brought byk theprimary feeder, constructed, arranged, and operating to pro. ject thepiecel step by step between the die and cutting block in alternationwith the cutting actions of the latter, and a means for arrestingthepiece fed by the primary feeder, when its advance endy is at a pointbetween the limits kof travel of the secondary feeder. j Y

l0. In a dieing out machine, the combination with a cutting die, itscomplemental cutting block, and means for moving one of said {elementstoward and away from the other, of` feeding means for propelling a pieceof stock at such times as to place successive adjacent points or areasin position to be cut bythe die, and a stop or gage arranged at thesidefof the die from which the stock advances and at such a point inrelation to the line of action of the die, and to the range of action ofthe feeder,

liek

as to enable the feeder in its first feeding, n

support for the stock to be cut, of an ine termittent work feederconstructed to feed suchy stockstep by step across the cutting` line ofthe die and arranged so that a piece of stock may be advanced intoposition to be operatively engaged by it, and means forl arresting theadvancing piece prior to the engagement of said feeder therewith.

f 12. In a .dieing out machine, the combination with a cutting die andthe coperating support for the stock to be cut, of an intermittentwork'feeder constructed to feed such stock step by step across thecutting line between the nearer of the die and arranged so that a pieceof stock may be advanced into position to be operatively engaged by it,and a displaced stop arranged across V,the path in which the stock is soadvanced, between the advancing piece and the die. Y

13. In a dieing out machine, the combination with a cutting die vand thelcoperating support for the stock to be cut, of an intermittent workfeeder constructed to feed such stock step by step across the cuttingline vof the die and arrangedy so that a piece of stock may be advancedinto possition to` be operativelyengaged by it, and

aV stop locatedvbetween the advancing piece' and the cutting line of thedie adaptedto be displaced Vin such timedrelation with the action of thefeeder as toV cause the first step of the feed imparted thereby to carrythe advancing edge of the piece .to a point and farther sides of thedie. i

141-. Ina dieing out machine, the combinaticnwith aV cutting die and thecoperating support for the stock to be cut, of 'an intermittent `workfeeder constructed t0 feed such stock step by step across the cuttingline of thevdie and arranged so that a piece of stock may be advancedinto position to be operatively engaged by it, and a stop arrangedbetween the line of action of the die and the advancing piece to arrestthe latter prior to the engagement of the feeder therewith, said stopbeing displaceable to permit the piece to be fed in a desired relationto the feeder. g

15. In a dieing out machine, the combination with a cutting die andthecoperating support for the stock to be cut, of an inter` mittent workfeeder constructed Vto feed such stock stepv by step across the cuttingline of the die and arranged soV that a piece of stock may be advancedintoV position to be operatively engaged by it, and a stop arranged toarrest the forward end ofthe advancing piece at a point short of that towhich the feeder is adapted to project such end, said stop beingdisplaceable to permit further propulsion of the piece after having beenso arrested.

16. In a machine of the character described having a cutting die and acutting block, an intermittent feeder'mounted so that it may move towardand away from the die, said feeder comprising a carrier, a dog pivotedon said carrier and having an arm, and an actuating bar movable back andforth in approximately the feeding direction and connected to said arm,whereby to move the dog bodily and also oscillatively about its pivot.

17. In amachine of the character -described, a work support,VV acarriage located at one side of the space occupied by the work andmovable back and forth, a feed dog pivoted on said carriage and movabletoward and away from such space, an arm projecting from said dog, and anactuating bar connected to said arm and movable in a line located at theopposite side of the pivot' of the dog from the location of the work,whereby movement of said arm is adapted to swing the dog upon its pivotand also to shiftthe dog and carrier. Y

18. In a dieing out machine, the combina tion of va cutting block and adie, a work guiding means, and dogs projecting from the work guidingmeans toward theV die at oppositesides of the latter fork locating thematerial acted upon centrally over the die, said dogs being yieldinglymounted and having beveled faces toward lthe die, whereby to be spreadapart by the die when the latter passes between them. Y

19. In a dieing out machine, a reciprocating cutting die, a complementalblock for holding the work against the thrust of the die, means foryguiding work between the die and block, dogs projecting from saidguiding means at4 each side of the path of theV stock toward the die,and being mounted to yield outwardly Vfrom the die, whereby to soposition the material acted upon that the die'may act centrally betweenthe edges of the material.

20. In a dieing out machine in combination with a die and a guide platefor guiding material across the cutting end of the die, a retainerextending toward the die at a distance from said plate sufficient toprovide a channel'for thel material, said retainer having its end nearthe die bent toward said plate and being supported at a point remotefrom the die and being resilient in construction, and a resilient stopholder extending between said retainer and said plate adjacent to theretainer and having a stop extending toward the plate at a point nearthe bent up end of the retainer, said retainer and stop being adapted toyield to permit passage of the work between them and the plate.v l .Y

YIn testimony whereof I have aflixed my signature, in presence yof twowitnesses.

GEORGE B. GROVER. I'Vitnesses H. ASHBY BOWEN, WILLIAM J. YOUNG.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner or Patents,

' Washington, D. C.

